Thermostatic pilot buflner



Patented flan. Q, 3934 THERMOSTATHC PKLQT BURNER,

Clarence H. Morrow, (lleveland, Ohio, assignor to The Hotstream HeaterCompany, Cleveland, 1 01:10, a corporation cl Ohio Application June22,1932. Serial No. 61%,832

3 Claims.

This invention relates to thermostatic pilot burners, its object beingto provide a pilot burner which is of very'simple form, which can bemade and sold at low cost, which is so constructed as to provide a hotand eflicient flame which is not easily blown out and whose gasconsumption is low, and particularly to provide a pilot burner which isso formed as to rapidly and efficiently communicate heat to thethermostatic element or elements with which it is associated for morerapid and accurate response to temperature changes, as will appear.

In the drawing Fig. 1 represents a side elevation, partly in section, onthe line 1-1, Fig. 2, through one form of thermostatic pilot burnerembodying the invention; Fig. 2 is a plan view, partly broken out and insection, on the line 2--2, Fig. 1, thereof; and Fig. 3 is-a broken outsectional perspective view of the burner.

While the burner forming the subject matter of the present invention maybe used in connection with various forms of thermostatic elements, forconvenience and in no sense of limitation it is shown assembled withthermostatic valve mechanism of the same form described, illustrated andclaimed in my prior application for Thermostatic gas valve. filedFebruary 3, 1932, Serial 'No. 590,572, to which reference may be had fora more complete description of the thermostatic 30 valve mechanism, ifdesired.

For the purposes of the present application. it is sufiicient to saythat the valve mechanism comprises a valve casing 1, the chamber ofwhich is provided with a ported cross wall 2, gas flow through theopening in which is controlled by a valve 3 moved toward its seat by aspring 4 and normally held open, when gas flow or supply is desired, byan adjustable slide 5 actuated by a spring 6, which tends to move theslide upwardly 49 in Fig. 1 or to the valve closing position. 7 and 8represent the gas supply and discharge pipes.

Associated with said valve mechanism are suitable thermostatic elements,including a relatively expansible member 10, which may be made ofcopper, brass or other materials with a high coefilcient of expansionunder heat, and a second member 11 which may be made of a material ofrelatively low coemclent of expansion, such as steel, iron or the like.Member 11 is of tubular form screwed into a part of the valve casing andsurrounding member 10, which is of rod form and is provided on its innerend with a reduced extension 12 sliding in a plug 13 with its inner endextending into the gas chamber and forming an obstacle to movement of alatch member 14 (Cl. ESQ-113) tached, as will appear. 59

The burner, shown in detail in Fig. 3, comprises one, or at most, 'twomembers. It has a body portion 16 threaded at 17 for connection to theend of rod 10, the body portion being provided with a minute port orpassage 18, the outer end of which opens into a through recess 19 of thebody lying between a plurality, two being shown,

of longitudinal side arms 20 connecting the body to an end disc or plate21 which is spaced some distance beyond the end or the port 18. Theouter end of the rod 10 is also providedwith a longitudinal passage 22communicating with a cross port 23 by which the jet port 18 is made tocommunicate with the chamber 24 within the tube 11 and surroundingtherod 10, said chamber communicating with a gas supply pipe 25.

With this arrangement, the supply of gas being turned on through thepipe 25, gas flows by way of the cross port 23 and passage 22 to the jetport 18, issuing therefrom under pressure in the 39 form of alongthread-like stream which impinges on the center of the disc or plate 21,being there mixedwith the air in the chamber 19, so that the gas mixtureflows outwardly toward the edges of the plate 21. When the burner isignited the flame is produced at the plate 21 and shoots out in alldirections from its center toward its edges and even slightly beyond thesame, the flame being blue and hot and very quickly and efiicientlyheating the plate. Because the entire burner, including the plate 21,bars 20 and base 16, is one solid piece of metal which may be made ofhighly heat conductive material, such as copper or brass, the heat ofthe flame is very rapidly communicated directly to the end of thethermostatic element 10 to which the burner is threaded, as a result orwhich variations in temperature caused by presence or absence of thepilot flame are rapidly communicated to the thermostatic elements with aquick response at the valve mecha- 10o nism controlled thereby.

For more efficient operation, the burner may also be supplied with meansfor directing the air supply into the chamber 19 and the flow ofproducts of combustion therefrom. The means shown for this purpose is awasher-like member 26, which is sleeved over the burner arms with atight connection thereon, such as by being a driving fit, and whichoccupies the position shown in the drawing midway between the ends ofsaid chamher. As a consequence, air enters the chamber in the burnerthrough the openings thereto at the left of the washer 26 in Fig. 1, andflame and products of combustion issue from said chamber 5 through thetwo openings thereto at the right of the washer in Fig. 1. Thisarrangement produces a sort of injector action which insures and guidesor directs the air flow and maintains the burner operating under allconditions.

What I claim is:

1. Thermostatic mechanism of the class described, comprising twocooperating thermostatic elements, one of which is formed of relativelyexpansible and the other of relatively non- -expansible material, theexpanslble element hav- 2. A burner, comprising a body portion providedwith a minute passage terminating in a jet orifice and with armsextending forwardly and provided with a plate at their outer ends lyingdirectly opposite said orifice and spaced therefrom to form a chamber,whereby the gas stream issuing from said orifice produces a flameimpinging upon said plate, and an air guiding member of annular formsurrounding said arms and providing therewith inlet and outlet openingsto said chamber.

3. A burner, comprising a body portion provided with a minute passageterminating in a jet orifice and with arms extending forwardly andprovided with a plate at their outer ends lying directly opposite saidorifice and spaced therefrom toform a chamber, whereby the gas streamissuing from said orifice produces a flame impinging upon said plate,and an air guiding member of annular form surrounding said arms andproviding therewith inlet and outlet openings to said chamber, saidannular member being of washer form with its general plane transverse tothe length of the gas stream.

CLARENCE H. MORROW.

